Brennan was focused on answering questions during his testimony. He wasn't asked about whether or not he looked at his watch. In his book he included more detail. It is that simple. Here is his relevant testimony:
Mr. BELIN. I ask you to state, if you know, what this is.
Mr. BRENNAN. Yes. That is the retaining wall
Representative Ford. Are those the positions where you were sitting on November 22?
Mr. BRENNAN. Yes, sir.
Representative FORD. At about 12
Mr. BRENNAN. From about 12:22 or 12:24 until the time of the assassination.
Fascinating analysis about Brennan's focus during the WC testimony....
And yet...
Mr. BELIN. And then after lunch, where did you go?
Mr. BRENNAN. I finished lunch and I glanced at a clock--I don't know exactly where the clock is located--and noticed it was 12:18. So I thought I still had a few minutes, that I might see the parade and the President. I walked to the corner of Houston and Elm.
Later he simply offers 12.22-12.24. No recollection of his watch at that point in 1964 under oath.
He offers this. He remembered a specific time leaving the cafe....go figure. He obviously lost focus later on and forgot about looking at his watch but remembered doing so for a book written years later.....of course. One published posthumously in 1987. Right on the money.
And you say I am full of it.....